Liquid crystal display device, method for driving liquid crystal display device, and electronic apparatus

ABSTRACT

A liquid crystal display device supplies an active scan signal to each scan line while skipping a portion of a plurality of the scan lines, per one horizontal scan period, in a direction of the m-th to the first scan lines, by a first scan line drive circuit, and supplies the active scan signal to each scan line while skipping the portion of the plurality of the scan lines, per one horizontal scan period, in a direction of the m+1-th to the 2m-th scan lines, by a second scan line drive circuit. Therefore, the liquid crystal display device synchronizes with a timing of supplying the active signal with the first scan line drive circuit and the second scan line drive circuit, and supplies a data signal whose polarity is inverted to a positive polarity potential and a negative polarity potential per one horizontal scan period, to a data line.

BACKGROUND

1. Technical Field

The present invention relates to a technical field of a liquid crystaldisplay device, a method for driving a liquid crystal display device,and an electronic apparatus such as a liquid crystal projector that isconfigured to include the liquid crystal display device.

2. Related Art

In a liquid crystal display panel with high resolution and highdefinition, there is a case where the number of scan lines is increased,and a contrast is lowered by a scan system, and thus, various methods toimprove this have been proposed. For example, the method of dividing theliquid crystal display panel into two screens above and below, and, inorder to prevent a joint portion of the two screens from beingdisplayed, applying an active scan voltage is applied with respect tothe first to the m-th scan lines which are arranged in a first region,in order, per one horizontal scan period, and after completing theapplication of the active scan voltage to the m-th scan line, applyingthe active scan voltage is applied with respect to the m+1-th to the2m-th scan lines which are arranged in a second region, in order, perone horizontal scan period, has been proposed (for example,JP-A-2008-70406).

However, in a device of JP-A-2008-70406, at the time of driving anactive system 3D (three-dimensional display), or at the time of drivinga field sequential, since a time which is necessary for rewriting of onescreen, is relevant to an amount which is obtained by multiplying thetotal number of scan lines in one horizontal scan period, it isnecessary to shorten a shutter open time of 3D (three-dimensionaldisplay) glasses, or, a lighting time of an RGB light source. Moreover,as the device of JP-A-2008-70406, when the first region is scanned fromabove toward below, and, further, the second region is subsequentlyscanned from above toward below, a phenomenon where an upper and lowerluminance difference occurs per a region, and the luminance differenceis emphasized in a boundary unit of the first region and the secondregion, occurs.

SUMMARY

An advantage of some aspects of the invention is to provide a liquidcrystal display device, a method for driving a liquid crystal displaydevice, and an electronic apparatus including the liquid crystal displaydevice without occurring a luminance difference in a boundary unit of afirst region and a second region while shortening a time which isnecessary for rewriting of one screen, even at the time of driving anactive system 3D (three-dimensional display), or at the time of drivinga field sequential.

According to an aspect of the invention, there is provided a liquidcrystal display device including a liquid crystal display panel that hasa first region and a second region, the first to the m-th scan linesthat are arranged in the first region, the m+1-th to the 2m-th scanlines that are arranged in the second region, n data lines intersectingwith the scan lines which are arranged in the first region, n data linesintersecting with the scan lines which are arranged in the secondregion, pixels that are installed to correspond to intersection of thescan lines and the data lines respectively, in each of the first regionand the second region, a first scan line drive circuit that drives fromthe first to the m-th scan lines, a second scan line drive circuit thatdrives from the m+1-th to the 2m-th scan lines, a first data line drivecircuit that drives the data line intersecting with the first to them-th scan lines, and a second data line drive circuit that drives thedata line intersecting with the m+1-th to the 2m-th scan lines, in whichthe first scan line drive circuit supplies an active scan signal to eachscan line while skipping a portion of a plurality of the scan lines, perone horizontal scan period, in a direction of the first to the m-th scanlines, or in a direction of the m-th to the first scan lines, the secondscan line drive circuit supplies the active scan signal to each scanline while skipping the portion of the plurality of the scan lines, perone horizontal scan period, in a direction of the 2m-th to the m+1-thscan lines which is a direction opposite to the supply direction of thescan signal to the scan line by the first scan line drive circuit, or ina direction of the m+1-th to the 2m-th scan lines, and the first dataline drive circuit and the second data line drive circuit synchronizewith a timing of supplying the active signal by the first scan linedrive circuit and the second scan line drive circuit, and supply a datasignal whose polarity is inverted to a positive polarity potential and anegative polarity potential per one horizontal scan period, to the dataline.

According to this aspect, in the first region, when the active scansignal is supplied to each scan line in the direction of the m-th to thefirst scan lines, in the second region, the active scan signal issupplied to each scan line in the direction of the m+1-th to the 2m-thscan lines which is the direction opposite to the first region.Moreover, in the first region, when the active scan signal is suppliedto each scan line in the direction of the first to the m-th scan lines,in the second region, the active scan signal is supplied to each scanline in the direction of the 2m-th to the m+1-th scan lines which is thedirection opposite to the first region. In this manner, in the firstregion and the second region, since the scan direction is made to be thedirection opposite to each other, in comparison with a case ofperforming the scan in the direction of the m+1-th to the 2m-th scanlines in the second region after performing the scan in the direction ofthe first to the m-th scan lines in the first region, it is possible toshorten the time which is necessary for rewriting of one screen.Furthermore, since the scan direction in the first region and the secondregion is the direction which is from the scan line close to theboundary unit of the first region and the second region, to the far scanline, or the direction which is from the scan line far from the boundaryunit, to the close scan line, it is possible to suppress the luminancedifference in the boundary unit.

Moreover, according to this aspect, in the first region and the secondregion, when the scan of the scan lines is performed, the scan is notperformed in order according to a layout of the scan lines, and eachscan line is scanned while skipping the portion of the plurality of thescan lines. In company therewith, the first data line drive circuit andthe second data line drive circuit synchronize with a timing of thescan, and supply the data signal whose the polarity is inverted to thepositive polarity potential and the negative polarity potential per onehorizontal scan period, to the data line. As a result, a period in whichthe voltage to an switching element of the pixel corresponding to eachscan line is biased to either of large and small according to a bias ofthe polarity, is shortened, and thus, it is possible to make a leakagecurrent amount of the switching element of the pixel uniform on thewhole, and it is possible to suppress an upper and lower luminancedifference itself.

In the liquid crystal display device according to the aspect describedabove, the second scan line drive circuit may move the timing ofsupplying the active scan signal to each scan line while skipping theportion of the plurality of the scan lines, in the direction of the2m-th to the m+1-th scan lines, or in the direction of the m+1-th to the2m-th scan lines, before or after as only two horizontal scan periodsfrom the timing of supplying the active scan signal to each scan linewhile skipping the portion of the plurality of the scan lines by thefirst scan line drive circuit, in the direction of the first to the m-thscan lines, or in the direction of the m-th to the first scan lines.According to the aspect, since a start timing of the scan is moved astwo horizontal scan periods in the first region and the second region, ahorizontal electric field occurs not only between all scan lines butalso between the boundary unit of the first region and the second regionand the scan lines. In the whole screen which is made up of the firstregion and the second region, the horizontal electric field occurs asthe same period, and thus, an occurrence amount of a reverse twistdomain is the same level. As a result, in comparison with a case ofoccurring no reverse twist domain only in the boundary unit of an upperside pixel area 30U and a lower side pixel area 30L, it is possible toprevent the boundary unit from being emphasized.

In the liquid crystal display device according to the aspect describedabove, the first data line drive circuit may drive the data lines inorder of the first to the n-th data lines, in the first region, thesecond data line drive circuit may drive the data lines in order of thefirst data line corresponding to the first data line of the first regionto the n-th data line corresponding to the n-th data line of the firstregion, in the second region, and the data signal having the samepolarity may be supplied to the data line corresponding to the firstregion and the second region. According to the aspect, since thepolarity of the applied voltage is made uniform in each line of the datalines in the whole screen which is made by combining the first regionand the second region, the start timing of the scan is moved in thefirst region and the second region, and thereby, it is possible toadjust an occurrence position and a period of the horizontal electricfield.

According to another aspect of the invention, there is provided a methodfor driving a liquid crystal display device which includes a liquidcrystal display panel that has a first region and a second region, thefirst to the m-th scan lines that are arranged in the first region, them+1-th to the 2m-th scan lines that are arranged in the second region, ndata lines intersecting with the scan lines which are arranged in thefirst region, n data lines intersecting with the scan lines which arearranged in the second region, pixels that are installed to correspondto intersection of the scan lines and the data lines respectively, ineach of the first region and the second region, a first scan line drivecircuit that drives from the first to the m-th scan lines, a second scanline drive circuit that drives from the m+1-th to the 2m-th scan lines,a first data line drive circuit that drives the data line intersectingwith the first to the m-th scan lines, and a second data line drivecircuit that drives the data line intersecting with the m+1-th to the2m-th scan lines, the method including supplying an active scan signalto each scan line while skipping a portion of a plurality of the scanlines, per one horizontal scan period, in a direction of the first tothe m-th scan lines, or in a direction of the m-th to the first scanlines, by the first scan line drive circuit, supplying the active scansignal to each scan line while skipping the portion of the plurality ofthe scan lines, per one horizontal scan period, in a direction of the2m-th to the m+1-th scan lines which is a direction opposite to thesupply direction of the scan signal to the scan line by the first scanline drive circuit, or in a direction of the m+1-th to the 2m-th scanlines, by the second scan line drive circuit, and synchronizing with atiming of supplying the active signal by the first scan line drivecircuit and the second scan line drive circuit, and supplying a datasignal whose polarity is inverted to a positive polarity potential and anegative polarity potential per one horizontal scan period, to the dataline, by the first data line drive circuit and the second data linedrive circuit.

Next, an electronic apparatus according to still another aspect of theinvention, includes the liquid crystal display device according to theaspect of the invention described above. Since the electronic apparatusdescribed above can shorten the time which is necessary for rewriting ofone screen in the display device such as a liquid crystal display, it ispossible to correspond to a case of shortening a writing time of a datavoltage per one pixel, by making more high resolution or the like.Moreover, it is possible to improve image quality, without emphasizingthe boundary unit of the screen which is divided into two, and withoutthe upper and lower luminance difference.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described with reference to the accompanyingdrawings, wherein like numbers reference like elements.

FIG. 1 is a block diagram illustrating a configuration of a liquidcrystal display device according to a first embodiment of the invention.

FIG. 2 is a circuit diagram illustrating a configuration of a pixel.

FIG. 3 is a diagram illustrating a state of a variation in polarity on ascreen following a flow of time.

FIG. 4 is a diagram illustrating an occurrence spot of a horizontalelectric field.

FIG. 5 is a timing chart illustrating a selection timing of a scansignal, a supply timing of a data signal, and the polarity.

FIG. 6 is a diagram illustrating a state of a variation in polarity on ascreen following a flow of time in a second embodiment of the invention.

FIG. 7 is a diagram illustrating the occurrence spot of the horizontalelectric field.

FIG. 8 is a timing chart illustrating the selection timing of the scansignal, the supply timing of the data signal, and the polarity.

FIG. 9 is a diagram illustrating a state of a variation in polarity on ascreen following a flow of time in a third embodiment of the invention.

FIG. 10 is a diagram illustrating the occurrence spot of the horizontalelectric field.

FIG. 11 is a timing chart illustrating the selection timing of the scansignal, the supply timing of the data signal, and the polarity.

FIG. 12 is a diagram illustrating a state of a variation in polarity ona screen following a flow of time in a fourth embodiment of theinvention.

FIG. 13 is a diagram illustrating the occurrence spot of the horizontalelectric field.

FIG. 14 is a timing chart illustrating the selection timing of the scansignal, the supply timing of the data signal, and the polarity.

FIG. 15 is a diagram illustrating a state of a variation in polarity ona screen following a flow of time in a comparative example.

FIG. 16 is a diagram illustrating the occurrence spot of the horizontalelectric field.

FIG. 17 is a diagram describing an occurrence state of an upper andlower luminance unevenness.

FIG. 18 is a diagram illustrating a state of a variation in polarity ona screen following a flow of time in a comparative example.

FIG. 19 is a diagram illustrating the occurrence spot of the horizontalelectric field.

FIG. 20 is an explanatory diagram illustrating an example of anelectronic apparatus.

FIG. 21 is an explanatory diagram illustrating another example of theelectronic apparatus.

DESCRIPTION OF EXEMPLARY EMBODIMENTS First Embodiment Configuration ofLiquid Crystal Display Device

FIG. 1 is a block diagram of a liquid crystal display device 100according to a first embodiment of the invention. The liquid crystaldisplay device 100 has an electro-optical panel 12, and a controlcircuit 14. The electro-optical panel 12 is divided into two screensabove and below, and includes an upper side pixel area 30U, and a lowerside pixel area 30L. Furthermore, the electro-optical panel 12 includesa drive circuit 40. In the upper side pixel area 30U and the lower sidepixel area 30L, a plurality of pixels (pixel circuit) PIX are arranged.In the drive circuit 40, an upper side data line drive circuit 44U thatdrives each pixel PIX of the upper side pixel area 30U, an upper sidescan line drive circuit 42U, a lower side data line drive circuit 44Lthat drive each pixel PIX of the lower side pixel area 30L, and a lowerside scan line drive circuit 42L, are included.

In the upper side pixel area 30U, m scan lines 32 extending in a ydirection which are from the first to the m-th, and n data lines 34 aextending in an x direction which intersects with the y direction, areformed (m and n are natural numbers). Furthermore, in the lower sidepixel area 30L, m scan lines 32 extending in the y direction which arefrom the m+1-th to the 2m-th, and n data lines 34 b extending in the xdirection which intersects with the y direction, are formed (m and n arethe natural numbers). Moreover, the first to the m-th scan lines 32 aredriven by the upper side scan line drive circuit 42U, and the m+1-th tothe 2m-th scan lines 32 are driven by the lower side scan line drivecircuit 42L, independently from the first to the m-th scan lines 32.

The plurality of the pixels PIX within the upper side pixel area 30U,are arranged in a matrix shape of vertical m rows×horizontal n columnscorresponding to each intersection of the scan line 32 and the data line34 a. Moreover, the plurality of the pixels PIX within the lower sidepixel area 30L, are arranged in a matrix shape of vertical mrows×horizontal n columns corresponding to each intersection of the scanline 32 and the data line 34 b.

FIG. 2 is a circuit diagram of each pixel PIX. As shown in FIG. 2, eachpixel PIX includes a liquid crystal element CL, and a switching elementSW. The liquid crystal element CL is an electro-optical element which isconfigured of a pixel electrode 62 and a common electrode 64 facing eachother, and a liquid crystal 66 between the two electrodes. According toan applied voltage between the pixel electrode 62 and the commonelectrode 64, transmittance (display gradation) of the liquid crystal 66varies. The switching element SW is configured of a thin film transistorof an N channel type where a gate is connected to the scan line 32. Theswitching element SW is interposed between the liquid crystal element CLand the data lines 34 a and 34 b, and controls an electrical connection(conduction/insulation) of the two. Furthermore, a configuration wherean auxiliary capacity is connected to the liquid crystal element CL inparallel, can be also employed.

The control circuit 14 controls the whole liquid crystal display device100, generates an image signal X on the basis of an input image dataDin, and supplies the image signal X to the drive circuit 40. Moreover,the control circuit 14 supplies control signals CTL of various kindswith respect to the drive circuit 40.

In the embodiment, in order to prevent a so-called ghosting, a polarityinversion drive which inverts polarity of a voltage applied to theliquid crystal element CL on a predetermined cycle, is employed. In theembodiment, a level of image signals S1 and S2 which are supplied to thepixel PIX through the data lines 34 a and 34 b, is inverted per onehorizontal scan period using a reference voltage as a center, and isfurther inverted per a unit period. In this example, the unit period isone vertical scan period. However, the unit period can be arbitrarilyset, for example, may be natural number of several times of the verticalscan period.

Among the drive circuit 40, the upper side data line drive circuit 44Usupplies image signals S1[1] to S1[n] which control the displaygradation of each pixel PIX in the upper side pixel area 30U, to eachpixel PIX. Moreover, the lower side data line drive circuit 44L suppliesimage signals S2[1] to S2[n] which control the display gradation of eachpixel PIX in the lower side pixel area 30L, to each pixel PIX. Among thedrive circuit 40, the upper side scan line drive circuit 42U selectseach scan line 32 in order described later, with the supply of scansignals G[1] to G[m] corresponding to each scan line 32 in the upperside pixel area 30U. A scan signal G[M] (M=1 to m) is set at apredetermined selection potential (that is, the scan line 32 of the M-throw is selected), and thereby, the switching element SW in each pixelPIX of the M-th row is transited to an on state at the same time.Furthermore, among the drive circuit 40, the lower side scan line drivecircuit 42L selects each scan line 32 in order described later, with thesupply of scan signals G[m+1] to G[2m] corresponding to each scan line32 in the lower side pixel area 30L. A scan signal G[N] (N=m+1 to 2m) isset at the predetermined selection potential (that is, the scan line 32of the N-th row is selected), and thereby, the switching element SW ineach pixel PIX of the N-th row is transited to the on state at the sametime.

The upper side data line drive circuit 44U supplies the image signalsS1[1] to S1[n] to each of the n data lines 34 a in synchronization withthe selection of the scan line 32 by the upper side scan line drivecircuit 42U. The potential of the image signals S1[1] to S1[n] which aresupplied to the data line 34 a at the time of selecting the scan line 32(when the switching element SW is controlled to the on state), is heldin the liquid crystal element CL, and each pixel PIX (liquid crystalelement CL) displays the gradation according to the potential thereof.The lower side data line drive circuit 44L supplies the image signalsS2[1] to S2[n] to each of the n data lines 34 b in synchronization withthe selection of the scan line 32 by the lower side scan line drivecircuit 42L. The potential of the image signals S2[1] to S2[n] which aresupplied to the data line 34 b at the time of selecting the scan line 32(when the switching element SW is controlled to the on state), is heldin the liquid crystal element CL, and each pixel PIX (liquid crystalelement CL) displays the gradation according to the potential thereof.

Drive System of Scan Line

Next, a drive system of the scan line in the liquid crystal displaydevice 100 of the embodiment, will be described in detail. FIG. 3 is adiagram illustrating a state of a variation in polarity on a screenfollowing a flow of time. In FIG. 3, an axis of the x directionindicates the time, and the axis of the y direction indicates a positionof the scan line 32. In FIG. 3, in order to simplify the description, anexample in which the scan lines 32 in the upper side pixel area 30U areeight of above1 to above8, and the scan lines 32 in the lower side pixelarea 30L are eight of below1 to below8, is described.

In FIG. 3, rectangular frames 80 which are plurally displayed, indicatesthe position of the scan line 32 selected in one horizontal scan period(1H). That is, a width of the x direction of the rectangular frame 80,corresponds to one horizontal scan period (1H). The polarity which isindicated within the rectangular frame 80, indicates the polarity of adata signal supplied to the data line. For example, one horizontal scanperiod (1H) which starts from a timing t0 in FIG. 3, indicates that thescan line 32 of above8, that is, the 8-th scan line 32 in the upper sidepixel area 30U is selected, and the scan line 32 of below1, that is, thefirst scan line 32 in the lower side pixel area 30L is selected.Moreover, when the scan line 32 of above8 and the scan line 32 of below1are selected, it is indicated that the polarity of the data signal whichis supplied to the data line 34 a and the data line 34 b, is positive(+).

FIG. 5 is a timing chart illustrating a selection timing of the scansignal, a supply timing of the data signal, and the polarity of theembodiment. In FIG. 5, the scan signals which are supplied to the scanlines 32 of above1 to above8, are indicated by GU[1] to GU[8].Furthermore, the scan signals which are supplied to the scan lines 32 ofbelow1 to below8, are indicated by GL[1] to GL[8]. In FIG. 5, the datasignals which are supplied to the data line 34 a intersecting with thescan lines 32 of above1 to above8, are indicated by S1[1] to S1[n].Moreover, the data signals which are supplied to the data line 34 bintersecting with the scan lines 32 of below1 to below8, are indicatedby S2[1] to S2[n]. The polarity of the data signals S1[1] to S1[n] andthe data signals S2[1] to S2[n], is switched between a positive polarityhaving a voltage value of 0V to +5V, and a negative polarity having thevoltage value of −5V to 0V, per one horizontal scan period.

As shown in FIG. 5, the upper side scan line drive circuit 42U generatesa Y clock signal CLY in synchronization with a horizontalsynchronization signal Hs which is output from the control circuit 14.Therefore, the upper side scan line drive circuit 42U synchronizes witha Y transfer start pulse DY of one frame (1F) cycle which is output fromthe control circuit 14, and selects the scan line 32 of the upper sidein the upper side pixel area 30U per one horizontal scan period. In theembodiment, the scan line 32 of the upper side is selected toward adirection which is from the scan line 32 of above8 closest to a boundaryunit of the upper side pixel area 30U and the lower side pixel area 30L,to the scan line 32 of above1 farthest from the boundary unit. However,instead of selecting the scan line 32 in layout order thereof, asabove8, above3, above1, above2, above6, above1, and above5, the upperscan line as five scan lines, and the lower scan line as four scan linesare alternately selected, per one horizontal scan period.

As shown in FIG. 5, the lower side scan line drive circuit 42L generatesthe Y clock signal CLY in synchronization with the horizontalsynchronization signal Hs which is output from the control circuit 14.Therefore, the lower side scan line drive circuit 42L synchronizes withthe Y transfer start pulse DY of one frame (1F) cycle which is outputfrom the control circuit 14, and selects the scan line 32 of the lowerside in the lower side pixel area 30L per one horizontal scan period. Inthe embodiment, on the contrary to the scan line 32 of the upper side,the scan line 32 of the lower side is selected toward the directionwhich is from the scan line 32 of below1 closest to the boundary unit ofthe upper side pixel area 30U and the lower side pixel area 30L, to thescan line 32 of below8 farthest from the boundary unit. However, insteadof selecting the scan line 32 in layout order thereof, as below1,below6, below2, below7, below3, below8, and below4, the lower scan lineas five scan lines, and the upper scan line as four scan lines arealternately selected, per one horizontal scan period.

As described above, in the embodiment, toward the direction which isfrom the scan line close to the boundary unit in the upper side pixelarea 30U, to the scan line far from the boundary unit, that is, towardan upper direction, the scan line is selected, and toward the directionwhich is from the scan line close to the boundary unit in the lower sidepixel area 30L, to the scan line far from the boundary unit, that is,toward an lower direction, the scan line is selected. The order of theselection is such that the upper scan line as five scan lines, and thelower scan line as four scan lines are alternately selected, in theupper side pixel area 30U, and the lower scan line as five scan lines,and the upper scan line as four scan lines are alternately selected, inthe lower side pixel area 30L, per one horizontal scan period. Moreover,the polarity of the data signal which is supplied to the data lines 34 aand 34 b intersecting with each scan line, is alternately switchedbetween the positive polarity and the negative polarity, per onehorizontal scan period. That is, in the embodiment, on the screen whichis divided into two, the scan referred to as a so-called region scan, isperformed.

As the embodiment, by separately performing the scan in the upper sidepixel area 30U and the lower side pixel area 30L, a time which isnecessary for rewriting of one screen, is finished at 8H which is eighttimes of one horizontal scan period (1H). In contrast, as a comparativeexample shown in FIG. 15, in the case of selecting the scan line 32 ofabove1 to the scan line 32 of below8 in order, as the time which isnecessary for the input data as one field to rewrite on the wholescreen, 16H which is 16 times of one horizontal scan period (1H), isnecessary. Consequently, in the embodiment, it is possible to rewriteone screen at double speed in comparison with the comparative exampleshown in FIG. 15, and a shutter open time of 3D glasses at the time ofdriving an active system 3D (three-dimensional display), or, a lightingtime of an RGB light source at the time of driving a field sequential,can be secured long.

Furthermore, as a comparative example shown in FIG. 15, in the case ofscanning from the scan line 32 of below1 to the scan line 32 of below8in the lower side pixel area after scanning from the scan line 32 ofabove1 to the scan line 32 of above8 in the upper side pixel area, anupper and lower luminance unevenness occurs in each of the upper sidepixel area and the lower side pixel area, as shown in FIG. 17. In thecase of driving the comparative example, for a reverse twist domainavoidance by a horizontal electric field between adjacent pixelsdescribed later, only the polarity inversion of the unit perioddescribed above is performed. Since the time which is from a polarityinversion timing up to writing the voltage according to the polarityinversion, is taken as the pixel corresponding to the scan line of thelower side, a voltage polarity which is held in the pixel written in aprevious time, and the voltage polarity which is applied to the dataline, are different, and thereby, the period in which a potentialdifferent of both ends the switching element of the pixel becomes large,becomes long, and a leakage current is increased. For example, in thecase of the liquid crystal of normally black, as shown in FIG. 17, ineach of the upper side pixel area and the lower side pixel area,reduction in luminance is larger in the lower side region than the upperside region, and it becomes a dark color. Consequently, in the boundaryunit, the lower side region of the upper side pixel area becomes thedark color, and the upper side region the lower side pixel area becomesa light color, and thus, the luminance difference in the boundary unitis emphasized.

However, in the embodiment, in the upper side pixel area 30U, the scanis performed in the direction which is from the scan line close to theboundary unit toward the scan line far from the boundary unit, and evenin the lower side pixel area 30L, the scan is performed in the directionwhich is from the scan line close to the boundary unit, toward the scanline far from the boundary unit. Since the scan direction in the upperside pixel area 30U is the direction which is opposite to the scandirection in the lower side pixel area 30L, it is possible to suppressthe luminance difference in the boundary unit of the upper side pixelarea 30U and the lower side pixel area 30L.

Even when the scan direction in the upper side pixel area 30U is thedirection which is opposite to the scan direction in the lower sidepixel area 30L, as shown in FIG. 18, in the case where the selectionorder of the scan line is the layout order of the scan line, in each ofthe upper side pixel area and the lower side pixel area, the period inwhich the data line has the same polarity, becomes long. In contrast, inthe case of the embodiment, since the region scan described above isperformed in each of the upper side pixel area and the lower side pixelarea, the period in which the data line has the same polarity, becomesshort, and the switching of the polarity can be averagely performed ineach of the upper side pixel area and the lower side pixel area. As aresult, in each of the upper side pixel area and the lower side pixelarea, it is possible to make a leakage current amount of the switchingelement of the pixel uniform on the whole, and it is possible tosuppress an upper and lower luminance difference itself.

In the case of the liquid crystal display panel as in the embodiment, ifthe potentials of the adjacent pixel electrodes are different, thehorizontal electric field is formed between the pixel electrodes, and ifa distance between the pixels becomes narrow, an effect which thehorizontal electric field has on an orientation of a liquid crystallayer, becomes large, and a defect on the display is generated.Specifically, when an orientation regulation direction of a horizontaloriented film which is formed to cover the horizontal electric fieldformed between the pixel electrodes and the pixel electrode is parallel,by the horizontal electric field, the reverse twist domain where liquidcrystal molecules are twisted in the direction opposite to an originaltwist direction, occurs on the pixel electrode, disorder is generated inan arrangement of the liquid crystal molecules on the single pixelelectrode, and disclination occurs in the pixel area of a white display.

In FIG. 4, spots indicated by a plurality of thick lines, indicateoccurrence spots of the horizontal electric field. As shown in FIG. 4,in the case of the embodiment, since the horizontal electric fieldoccurs only in the same period between the all scan lines, an occurrenceamount of the reverse twist domain is made almost uniform in the wholescreen. However, since the horizontal electric field does not occur inthe boundary unit of the upper side pixel area 30U and the lower sidepixel area 30L, the difference between other portions is generated.

FIG. 19 indicates the occurrence spot of the horizontal electric fieldin the comparative example of FIG. 18. As shown in FIG. 19, in the caseof the comparative example, since the horizontal electric field occursonly in the same period between the all scan lines, the occurrenceamount of the reverse twist domain is made almost uniform in the wholescreen. In the case of the comparative example, since the horizontalelectric field does not occur in the boundary unit of the upper sidepixel area and the lower side pixel area, the difference between otherportions is generated. On the other hand, FIG. 16 indicates theoccurrence spot of the horizontal electric field in the comparativeexample shown in FIG. 15. As shown in FIG. 16, in the case of thecomparative example, since not only the horizontal electric field occursonly in the same period between the all scan lines, but also thehorizontal electric field occurs in the boundary unit of the upper sidepixel area and the lower side pixel area, the occurrence amount of thereverse twist domain is made uniform in the whole screen, and theboundary unit is not emphasized.

Second Embodiment

Next, a second embodiment of the invention will be described withreference to FIG. 6 to FIG. 8. The liquid crystal display device 100 ofthe embodiment, is configured in almost the same manner as the liquidcrystal display device 100 of the first embodiment, but the scandirection in the upper side pixel area 30U and the lower side pixel area30L is different from that of the first embodiment.

FIG. 6 is a diagram illustrating a state of a variation in polarity on ascreen following a flow of time in the embodiment. FIG. 8 is a timingchart illustrating the selection timing of the scan signal, the supplytiming of the data signal, and the polarity of the embodiment. As shownin FIG. 6 and FIG. 8, in the embodiment, in the upper side pixel area30U, eight horizontal scan periods (8H) which start from the timing t0in FIG. 6, select the scan line 32, toward the direction which is fromthe scan line 32 of above5 far from the boundary unit of the upper sidepixel area 30U and the lower side pixel area 30L, to the scan line 32 ofabove8 closest to the boundary unit. However, in the embodiment, insteadof selecting the scan line 32 in layout order thereof, as above5,above1, above6, above2, above7, above3, and above8, the upper scan lineas four scan lines, and the lower scan line as five scan lines arealternately selected, per one horizontal scan period.

Similarly, in the lower side pixel area 30L, on the contrary to the scanline 32 of the upper side pixel area 30U, the scan line 32 is selectedtoward the direction which is from the scan line 32 of below4 far fromthe boundary unit of the upper side pixel area 30U and the lower sidepixel area 30L, to the scan line 32 of below1 closest to the boundaryunit. However, instead of selecting the scan line 32 in layout orderthereof, as below4, below8, below3, below7, below2, below6, and below1,the lower scan line as four scan lines, and the upper scan line as fivescan lines are alternately selected, per one horizontal scan period.

In the embodiment, the direction which is from the scan line far fromthe boundary unit in the upper side pixel area 30U, to the scan lineclose to the boundary unit, that is, toward the lower direction, thescan line is selected, and the direction which is from the scan line farfrom the boundary unit in the lower side pixel area 30L, to the scanline close to the boundary unit, that is, toward the upper direction,the scan line is selected. The order of the selection is such that theupper scan line as four scan lines, and the lower scan line as five scanlines are alternately selected, in the upper side pixel area 30U, andthe lower scan line as four scan lines, and the upper scan line as fivescan lines are alternately selected, in the lower side pixel area 30L,per one horizontal scan period. Moreover, the polarity of the datasignal which is supplied to the data lines 34 a and 34 b intersectingwith each scan line, is alternately switched between the positivepolarity and the negative polarity, per one horizontal scan period. Thatis, in the embodiment, on the screen which is divided into two, the scanreferred to as the so-called region scan, is performed.

In the embodiment, by separately performing the scan in the upper sidepixel area 30U and the lower side pixel area 30L, the time which isnecessary for rewriting of one screen, is finished at 8H which is eighttimes of one horizontal scan period (1H), and it is possible to rewriteone screen at double speed in comparison with the comparative exampleshown in FIG. 15. Consequently, the shutter open time of the 3D glassesat the time of driving the active system 3D (three-dimensional display),or, the lighting time of the RGB light source at the time of driving thefield sequential, can be secured long.

Moreover, in the embodiment, in the upper side pixel area 30U, the scanis performed in the direction which is from the scan line far from theboundary unit, toward the scan line close to the boundary unit, and evenin the lower side pixel area 30L, the scan is performed in the directionwhich is from the scan line far from the boundary unit, toward the scanline close to the boundary unit. Since the scan direction in the upperside pixel area 30U is the direction which is opposite to the scandirection in the lower side pixel area 30L, it is possible to suppressthe luminance difference in the boundary unit of the upper side pixelarea 30U and the lower side pixel area 30L.

In the case of the embodiment, in the same manner as the firstembodiment, since the region scan described above is performed in eachof the upper side pixel area and the lower side pixel area, the periodin which the data line has the same polarity, becomes short, and theswitching of the polarity can be averagely performed in each of theupper side pixel area and the lower side pixel area. As a result, ineach of the upper side pixel area and the lower side pixel area, it ispossible to make the leakage current amount of the switching element ofthe pixel uniform on the whole, and it is possible to suppress the upperand lower luminance difference itself.

In FIG. 7, the spots indicated by the plurality of the thick lines,indicate the occurrence spots of the horizontal electric field in theembodiment. As shown in FIG. 7, in the case of the embodiment, since thehorizontal electric field occurs only in the same period between the allscan lines, the occurrence amount of the reverse twist domain can bemade almost uniform in the whole screen. However, since the horizontalelectric field does not occur in the boundary unit of the upper sidepixel area 30U and the lower side pixel area 30L, the difference betweenother portions is generated.

Third Embodiment

Next, a third embodiment of the invention will be described withreference to FIG. 9 to FIG. 11. The liquid crystal display device 100 ofthe embodiment, is configured in almost the same manner as the liquidcrystal display device 100 of the first embodiment, but a point where ascan start timing in the upper side pixel area 30U, and a scan starttiming in the lower side pixel area 30L, are delayed as two horizontalscan periods, is different from that of the first embodiment.

FIG. 9 is a diagram illustrating a state of a variation in polarity on ascreen following a flow of time in the embodiment. FIG. 11 is a timingchart illustrating the selection timing of the scan signal, the supplytiming of the data signal, and the polarity of the embodiment. As shownin FIG. 9 and FIG. 11, in the embodiment, in the upper side pixel area30U, one horizontal scan periods (1H) which starts from the timing t0 inFIG. 9, selects the scan line 32, toward the direction which is from thescan line 32 of above8 closest to the boundary unit of the upper sidepixel area 30U and the lower side pixel area 30L, to the scan line 32 ofabove1 farthest from the boundary unit, in the same manner as the firstembodiment. However, in the embodiment, instead of selecting the scanline 32 in layout order thereof, as above8, above3, above1, above2,above6, above1, and above5, the upper scan line as five scan lines, andthe lower scan line as four scan lines are alternately selected, per onehorizontal scan period.

On the other hand, in the lower side pixel area 30L, instead of startingthe scan from the timing t0 shown in FIG. 9, the scan is started from atiming t1 which is shifted as one horizontal scan period (1H) from thetiming t0. That is, one horizontal scan period (1H) from the timing t1selects the scan line 32, toward the direction which is from the scanline 32 of below1 closest to the boundary unit of the upper side pixelarea 30U and the lower side pixel area 30L, to the scan line 32 ofbelow8 farthest from the boundary unit. However, instead of selectingthe scan line 32 in layout order thereof, as below5, below1, below6,below2, below1, below3, and below8, the upper scan line as four scanlines, and the lower scan line as five scan lines are alternatelyselected, per one horizontal scan period.

In FIG. 10, the spots indicated by the plurality of the thick lines,indicate the occurrence spots of the horizontal electric field in theembodiment. In the case of the embodiment, not only the horizontalelectric field occurs only in the same period between the all scanlines, but also the horizontal electric field occurs in the boundaryunit of the upper side pixel area 30U and the lower side pixel area 30L,as shown with the spot which is surrounded by an oval of a dotted linein FIG. 10. As a result, since the horizontal electric field occurs notonly in the upper side pixel area 30U and the lower side pixel area 30L,but also in the boundary unit of the upper side pixel area 30U and thelower side pixel area 30L, the occurrence amount of the reverse twistdomain is made uniform in the whole screen. As a result, the boundaryunit of the upper side pixel area 30U and the lower side pixel area 30L,is not emphasized.

Furthermore, in the embodiment, the direction which is from the scanline close to the boundary unit in the upper side pixel area 30U, to thescan line far from the boundary unit, that is, toward the upperdirection, the scan line is selected, and the direction which is fromthe scan line close to the boundary unit in the lower side pixel area30L, to the scan line far from the boundary unit, that is, toward thelower direction, the scan line is selected. Therefore, the order of theselection is such that the upper scan line as five scan lines, and thelower scan line as four scan lines are alternately selected, in theupper side pixel area 30U, and the lower scan line as five scan lines,and the upper scan line as four scan lines are alternately selected, inthe lower side pixel area 30L, per one horizontal scan period. Moreover,the polarity of the data signal which is supplied to the data lines 34 aand 34 b intersecting with each scan line, is alternately switchedbetween the positive polarity and the negative polarity, per onehorizontal scan period. That is, in the embodiment, on the screen whichis divided into two, the scan referred to as the so-called region scan,is performed.

In the embodiment, by separately performing the scan in the upper sidepixel area 30U and the lower side pixel area 30L, the time which isnecessary for rewriting of one screen, is finished at 8H which is eighttimes of one horizontal scan period (1H), and it is possible to rewriteone screen at double speed in comparison with the comparative exampleshown in FIG. 15. Consequently, the shutter open time of the 3D glassesat the time of driving the active system 3D (three-dimensional display),or, the lighting time of the RGB light source at the time of driving thefield sequential, can be secured long.

Furthermore, in the embodiment, in the upper side pixel area 30U, thescan is performed in the direction which is from the scan line close tothe boundary unit, toward the scan line far from the boundary unit, andeven in the lower side pixel area 30L, the scan is performed in thedirection which is from the scan line close to the boundary unit, towardthe scan line far from the boundary unit. Since the scan direction inthe upper side pixel area 30U is the direction which is opposite to thescan direction in the lower side pixel area 30L, it is possible tosuppress the luminance difference in the boundary unit of the upper sidepixel area 30U and the lower side pixel area 30L.

In the case of the embodiment, in the same manner as the firstembodiment, since the region scan described above is performed in eachof the upper side pixel area and the lower side pixel area, the periodin which the pixel corresponding to each scan line holds the samepolarity, becomes short, and the switching of the polarity can beaveragely performed in each of the upper side pixel area and the lowerside pixel area. As a result, in each of the upper side pixel area andthe lower side pixel area, it is possible to make the leakage currentamount of the switching element of the pixel uniform on the whole, andit is possible to suppress the upper and lower luminance differenceitself.

According to the embodiment as described above, in the same manner asthe first embodiment, it is possible to shorten the time which isnecessary for rewriting of one screen, and not only the upper and lowerluminance difference itself can be suppressed by the region scan, butalso the reverse twist domain is not nearly conspicuous in the wholescreen, since the horizontal electric field occurs not only in the upperside pixel area 30U and the lower side pixel area 30L, but also in theboundary unit of the upper side pixel area 30U and the lower side pixelarea 30L, by shifting the scan start timing in the lower side pixel area30L. As a result, it is possible to prevent the boundary unit of theupper side pixel area 30U and the lower side pixel area 30L from beingemphasized.

Fourth Embodiment

Next, a fourth embodiment of the invention will be described withreference to FIG. 12 to FIG. 14. The liquid crystal display device 100of the embodiment, is configured in almost the same manner as the liquidcrystal display device 100 of the third embodiment, but the scandirection in the upper side pixel area 30U and the lower side pixel area30L, is different from that of the third embodiment.

FIG. 12 is a diagram illustrating a state of a variation in polarity ona screen following a flow of time, in the embodiment. FIG. 14 is atiming chart illustrating the selection timing of the scan signal, thesupply timing of the data signal, and the polarity of the embodiment. Asshown in FIG. 12 and FIG. 14, in the embodiment, eight horizontal scanperiods (8H) which start from the timing t0 in FIG. 14, starts the scanfrom the timing t1 which is shifted as one horizontal scan period (1H)backwards from the timing t0. In the same manner as the secondembodiment, in the upper side pixel area 30U, the scan line 32 isselected, toward the direction which is from the scan line 32 of above5far from the boundary unit of the upper side pixel area 30U and thelower side pixel area 30L, to the scan line 32 of above8 closest to theboundary unit. However, in the embodiment, instead of selecting the scanline 32 in layout order thereof, as above5, above1, above6, above2,above7, above3, and above8, the upper scan line as four scan lines, andthe lower scan line as five scan lines are alternately selected, per onehorizontal scan period.

On the other hand, in the lower side pixel area 30L, the scan of thescan line 32 of below5 corresponding to the scan line 32 of above5, isstarted from the timing t0 shown in FIG. 12. That is, from the timingt0, the scan line 32 is selected toward the direction which is from thescan line 32 of below8 farthest from the boundary unit of the upper sidepixel area 30U and the lower side pixel area 30L, to the scan line 32 ofbelow1 closest to the boundary unit. However, instead of selecting thescan line 32 in layout order thereof, as below8, below3, below7, below2,below6, below7, below2, below6, below1, and below4, the lower scan lineas four scan lines, and the upper scan line as five scan lines arealternately selected, per one horizontal scan period.

In FIG. 13, the spots indicated by the plurality of the thick lines,indicate the occurrence spots of the horizontal electric field in theembodiment. In the case of the embodiment, not only the horizontalelectric field occurs only in the same period between the all scanlines, but also the horizontal electric field occurs in the boundaryunit of the upper side pixel area 30U and the lower side pixel area 30L,as shown with the spot which is surrounded by the oval of the dottedline in FIG. 13. As a result, since the horizontal electric field occursnot only in the upper side pixel area 30U and the lower side pixel area30L, but also in the boundary unit of the upper side pixel area 30U andthe lower side pixel area 30L, the occurrence amount of the reversetwist domain is made uniform in the whole screen. As a result, theboundary unit of the upper side pixel area 30U and the lower side pixelarea 30L, is not emphasized.

Furthermore, in the embodiment, the direction which is from the scanline close to the boundary unit in the upper side pixel area 30U, to thescan line far from the boundary unit, that is, toward the upperdirection, the scan line is selected, and the direction which is fromthe scan line close to the boundary unit in the lower side pixel area30L, to the scan line far from the boundary unit, that is, toward thelower direction, the scan line is selected. Therefore, the order of theselection is such that the upper scan line as five scan lines, and thelower scan line as four scan lines are alternately selected, in theupper side pixel area 30U, and the lower scan line as five scan lines,and the upper scan line as four scan lines are alternately selected, inthe lower side pixel area 30L, per one horizontal scan period. Moreover,the polarity of the data signal which is supplied to the data lines 34 aand 34 b intersecting with each scan line, is alternately switchedbetween the positive polarity and the negative polarity, per onehorizontal scan period. That is, in the embodiment, on the screen whichis divided into two, the scan referred to as the so-called region scan,is performed.

Also in the embodiment, by separately performing the scan in the upperside pixel area 30U and the lower side pixel area 30L, the time which isnecessary for rewriting of one screen, is finished at 8H which is eighttimes of one horizontal scan period (1H), and it is possible to rewriteone screen at double speed in comparison with the comparative exampleshown in FIG. 15. Consequently, the shutter open time of the 3D glassesat the time of driving the active system 3D (three-dimensional display),or, the lighting time of the RGB light source at the time of driving thefield sequential, can be secured long.

Moreover, in the embodiment, in the upper side pixel area 30U, the scanis performed in the direction which is from the scan line far form theboundary unit, toward the scan line close to the boundary unit, and evenin the lower side pixel area 30L, the scan is performed in the directionwhich is from the scan line far from the boundary unit, toward the scanline close to the boundary unit. Since the scan direction in the upperside pixel area 30U is the direction which is opposite to the scandirection in the lower side pixel area 30L, it is possible to suppressthe luminance difference in the boundary unit of the upper side pixelarea 30U and the lower side pixel area 30L.

In the case of the embodiment, in the same manner as the thirdembodiment, since the region scan described above is performed in eachof the upper side pixel area and the lower side pixel area, the periodin which the data line has the same polarity, becomes short, and theswitching of the polarity can be averagely performed in each of theupper side pixel area and the lower side pixel area. As a result, ineach of the upper side pixel area and the lower side pixel area, it ispossible to make the leakage current amount of the switching element ofthe pixel uniform on the whole, and it is possible to suppress the upperand lower luminance difference itself.

According to the embodiment as described above, in the same manner asthe third embodiment, it is possible to shorten the time which isnecessary for rewriting of one screen, and not only the upper and lowerluminance difference itself can be suppressed by the region scan, butalso the occurrence amount of the reverse twist domain is the same levelin the whole screen, since the horizontal electric field occurs not onlyin the upper side pixel area 30U and the lower side pixel area 30L, butalso in the boundary unit of the upper side pixel area 30U and the lowerside pixel area 30L, by shifting the scan start timing in the lower sidepixel area 30L. As a result, it is possible to prevent the boundary unitfrom being emphasized, in comparison with the case of occurring noreverse twist domain only in the boundary unit of the upper side pixelarea 30U and the lower side pixel area 30L.

Modification Example

The present invention is not limited to each embodiment described above,and for example, modifications of various kinds described hereinafter,are practicable. Furthermore, needless to say, each embodiment and eachmodification may be appropriately combined.

(1) In each embodiment described above, as a drive system of the scanline, the drive system indicated by the timing chart of FIG. 5, FIG. 8,FIG. 11, or FIG. 14, is described as an example, but the invention isnot limited to the drive system thereof. If it is possible to shortenthe time which is necessary for rewriting of one screen, and to suppressthe upper and lower luminance difference, and to prevent the boundaryunit of the upper side pixel area 30U and the lower side pixel area 30Lfrom being emphasized, the drive system other than this, can beappropriately employed.

(2) In the embodiment described above, the liquid crystal is adopted asan example of an electro-optical material, but the invention is appliedto an electro-optical device using the electro-optic material other thanthe above. The electro-optical material is a material whose opticalproperties such as transmittance or luminance vary by the supply of anelectrical signal (current signal or voltage signal). For example, inthe same manner as the embodiments described above, the invention can beapplied with respect to the electro-optical devices of various kindssuch as a display panel using a light emitting element such as organicEL (ElectroLuminescent), inorganic EL, and a light emitting polymer, anelectrophoresis display panel using a microcapsule including a coloredliquid and white particles dispersed in the liquid, as anelectro-optical material, a twist ball display panel using twist ballswhich are painted dividing into a different color per the region whosethe polarity differs, as an electro-optical material, a toner displaypanel using a black toner as an electro-optical material, or a plasmadisplay panel using high pressure gas such as helium and neon, as anelectro-optical material.

Application Example

The invention can be used in electronic apparatuses of various kinds.FIG. 20 and FIG. 21 are diagrams exemplifying a concrete form of anelectronic apparatus which is an application target of the invention.

FIG. 20 is a diagram illustrating an example of an appearanceconfiguration of a projector using the liquid crystal display device ofthe invention. As shown in FIG. 20, a projector 2100 is a stationarytype. In front thereof, a projection lens 2114 for projecting video isinstalled, and on a top plate thereof, a push-on type switch 38 thatinstructs an input and a cut off of power supply is installed.

FIG. 21 is a plan view illustrating an example of an opticalconfiguration of the projector 2100. As shown in FIG. 21, the projector2100 is a so-called three-plate type, using transmission type liquidcrystal light valves 100R, 100G, and 100B. In the liquid crystal lightvalves 100R, 100G, and 100B, the liquid crystal display device 100 ofthe invention is used.

Inside the projector 2100, a light source device 1 is installed, analternating current is supplied to a discharge lamp 500 from a drivedevice 200, and a white light is emitted from the discharge lamp 500,and is shot out by an optical member such as a main reflection mirror inthe three o'clock direction in the drawing. The white light which isshot out, is separated into three primary colors of R (red), G (green),and B (blue), by three sheets of mirror 2106, and dichroic mirrors 2108and 2109 which are arranged inside, and is incident to the liquidcrystal light valves 100R, 100G, and 100B corresponding to each primarycolor, respectively. In detail, among the white light which is incidentfrom nine o'clock direction in the drawing, the dichroic mirror 2108transmits the light of a wavelength region of R, and reflects the lightof the wavelength region of the rest G and B, in the six o'clockdirection. Among the light of the wavelength region of G and B which areincident from the twelve o'clock direction, the dichroic mirror 2109transmits the light of the wavelength region of B, and reflects thelight of the wavelength region of G, other than the above, in the threeo'clock direction. Furthermore, if B is compared with R and G, a lightpath is long, and thus, in order to prevent the loss thereof, it isguided through a relay lens system 2121 which is made up of an incidencelens 2122, a relay lens 2123, and an emission lens 2124.

In the projector 2100, video signals corresponding to each of the colorsR, G, and B, are supplied from an upper position circuit which is notshown in the drawing, respectively, and each of the liquid crystal lightvalves 100R, 100G, and 100B are driven by the video signalscorresponding to each of R, G, and B, respectively. Hereby, the lightwhich is incident to the liquid crystal light valves 100R, 100G, and100B, is emitted by modulating the transmittance per each pixel. Thatis, the liquid crystal light valves 100R, 100G, and 100B, functions as amodulation device that modulates the light shot out from the dischargelamp 500, on the basis of the video signal (image information).

The light which is modulated by the liquid crystal light valves 100R,100G, and 100B, respectively, is incident to a dichroic prism 2112 fromthree directions. Therefore, in the dichroic prism 2112, the light of Rand B is refracted at 90 degrees, on the other hand, the light of G goesstraight. Accordingly, after the modulated light of each color iscomposed, a color image is projected on a screen 2120 by the projectionlens 2114. The optical systems functions as a projection device thatprojects the light modulated by the liquid crystal light valves 100R,100G, and 100B, respectively.

Furthermore, in the liquid crystal light valves 100R, 100G, and 100B,since the light corresponding to each of R, G, and B is incident, by thedichroic mirror 2108, a color filter is not installed as a directviewing type. Moreover, an transmission image of the liquid crystallight valves 100R and 100B is projected after being reflected by thedichroic prism 2112, on the contrary thereto, the transmission image ofthe liquid crystal light valve 100G is intactly projected, and thus, thehorizontal scan direction by the liquid crystal light valves 100R and100B, is the direction opposite to the horizontal scan direction by theliquid crystal light valve 100G, and a left and right inverted image iscreated.

In the projector 2100 as described above, in the liquid crystal lightvalves 100R, 100G, and 100B, the liquid crystal display device 100 ofthe invention is used. Therefore, it is possible to provide theprojector of high image quality without the upper and lower luminanceunevenness.

Furthermore, as the electronic apparatus to which the invention isapplied, in addition to the device illustrated in FIG. 20 and FIG. 21, aportable information terminal (PDA: Personal Digital Assistants), adigital still camera, a television, a video camera, a car navigationdevice, an on-vehicle display device (instrument panel), an electronicnotebook, an electronic paper, a calculator, a word processor, aworkstation, a TV telephone, a POS terminal, a printer, a scanner, acopying machine, a video player, an apparatus including a touch paneland the like, are exemplified.

This application claims priority to Japan Patent Application No.2013-227962 filed Nov. 1, 2013, the entire disclosures of which arehereby incorporated by reference in their entireties.

What is claimed is:
 1. A liquid crystal display device comprising: aliquid crystal display panel that has a first region and a secondregion; the first to the m-th scan lines that are arranged in the firstregion; the m+1-th to the 2m-th scan lines that are arranged in thesecond region; n data lines intersecting with the scan lines which arearranged in the first region; n data lines intersecting with the scanlines which are arranged in the second region; pixels that are installedto correspond to intersection of the scan lines and the data linesrespectively, in each of the first region and the second region; a firstscan line drive circuit that drives from the first to the m-th scanlines; a second scan line drive circuit that drives from the m+1-th tothe 2m-th scan lines; a first data line drive circuit that drives thedata line intersecting with the first to the m-th scan lines; and asecond data line drive circuit that drives the data line intersectingwith the m+1-th to the 2m-th scan lines, wherein the first scan linedrive circuit supplies an active scan signal to each scan line whileskipping a portion of a plurality of the scan lines, per one horizontalscan period, in a direction of the first to the m-th scan lines, or in adirection of the m-th to the first scan lines, the second scan linedrive circuit supplies the active scan signal to each scan line whileskipping the portion of the plurality of the scan lines, per onehorizontal scan period, in a direction of the 2m-th to the m+1-th scanlines which is a direction opposite to the supply direction of the scansignal to the scan line by the first scan line drive circuit, or in adirection of the m+1-th to the 2m-th scan lines, and the first data linedrive circuit and the second data line drive circuit synchronize with atiming of supplying the active signal by the first scan line drivecircuit and the second scan line drive circuit, and supply a data signalwhose polarity is inverted to a positive polarity potential and anegative polarity potential per one horizontal scan period, to the dataline.
 2. The liquid crystal display device according to claim 1, whereinthe second scan line drive circuit moves the timing of supplying theactive scan signal to each scan line while skipping the portion of theplurality of the scan lines, in the direction of the 2m-th to the m+1-thscan lines, or in the direction of the m+1-th to the 2m-th scan lines,before or after as only two horizontal scan periods from the timing ofsupplying the active scan signal to each scan line while skipping theportion of the plurality of the scan lines by the first scan line drivecircuit, in the direction of the first to the m-th scan lines, or in thedirection of the m-th to the first scan lines.
 3. An electronicapparatus comprising: the liquid crystal display device according toclaim
 2. 4. The liquid crystal display device according to claim 1,wherein the first data line drive circuit drives the data lines in orderof the first to the n-th data lines, in the first region, the seconddata line drive circuit drives the data lines in order of the first dataline corresponding to the first data line of the first region to then-th data line corresponding to the n-th data line of the first region,in the second region, and the data signal having the same polarity issupplied to the data line corresponding to the first region and thesecond region.
 5. An electronic apparatus comprising: the liquid crystaldisplay device according to claim
 4. 6. An electronic apparatuscomprising: the liquid crystal display device according to claim
 1. 7. Amethod for driving a liquid crystal display device, which includes aliquid crystal display panel that has a first region and a secondregion, the first to the m-th scan lines that are arranged in the firstregion, the m+1-th to the 2m-th scan lines that are arranged in thesecond region, n data lines intersecting with the scan lines which arearranged in the first region, n data lines intersecting with the scanlines which are arranged in the second region, pixels that are installedto correspond to intersection of the scan lines and the data linesrespectively, in each of the first region and the second region, a firstscan line drive circuit that drives from the first to the m-th scanlines, a second scan line drive circuit that drives from the m+1-th tothe 2m-th scan lines, a first data line drive circuit that drives thedata line intersecting with the first to the m-th scan lines, and asecond data line drive circuit that drives the data line intersectingwith the m+1-th to the 2m-th scan lines, the method comprising:supplying an active scan signal to each scan line while skipping aportion of a plurality of the scan lines, per one horizontal scanperiod, in a direction of the first to the m-th scan lines, or in adirection of the m-th to the first scan lines, by the first scan linedrive circuit; supplying the active scan signal to each scan line whileskipping the portion of the plurality of the scan lines, per onehorizontal scan period, in a direction of the 2m-th to the m+1-th scanlines which is a direction opposite to the supply direction of the scansignal to the scan line by the first scan line drive circuit, or in adirection of the m+1-th to the 2m-th scan lines, by the second scan linedrive circuit; and synchronizing with a timing of supplying the activesignal by the first scan line drive circuit and the second scan linedrive circuit, and supplying a data signal whose polarity is inverted toa positive polarity potential and a negative polarity potential per onehorizontal scan period, to the data line, by the first data line drivecircuit and the second data line drive circuit.